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Leases (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2019	Oct. 01, 2019	Sep. 30, 2019
Amounts Recognized on TVA's Consolidated Balance Sheet [Line Items]
Operating lease assets, net of amortization	$ 192
Finance lease, asset	143
Lease assets	335
Operating Lease, Liability, Current	72		$ 0
Finance Lease, Liability, Current	6
Operating Lease, Liability, Noncurrent	130
Finance Lease, Liability, Noncurrent	180
Lease liabilities	388
Operating Lease, Asset		$ 205
Operating Lease, Liability		$ 210
Short-term Lease, Cost	1
Operating Leases, Rent Expense	$ 18

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Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

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